Dump vehicle construction



0d- 26, 1943. L. s. woon f 2,332,961 y DUMP VEHICLE CONSTRUCTION Filed Nov. 7, 1941 2 Sheets-Sheet l /ff E --L- l JNVENTOR aula 5 l/l/oa.'

A T T ORNE K5.

Och 26,1943. L. s. WOOD 2,332,961

DUMP VEHICLE CONSTRUCTION INVENTOR By l 0112.5 $WZ TT ORNE YS.

Patented Oct. 26, 1943 Norifice from CONSTRUCTION Louis Wood; Grosse Pointe Farms, fMich.; as- C 'signor to G'arfWoodr-Industries, Inc., Detroit, 'i i `nichtaldiiioratiqr;oflinehirangY Y f fiippiiedqrji'nqvihber '1, 1941, semina 418,115

v y f -aciaima (Crass-22) f The' present invention relates to hydraulic rhoistLconstruotions `for use on :dump vehicles and is particularly :directed to improvements overthe `structure -disclosed and claimed inrthe LQuisS. Wood Patent No. 2,226,213, grantedDecember2fl,

.One ofthe primary objects `ofethe ,presentfinf `verition is vto* provide improvements in hoisting devices `of the type mentioned in which the'liftf ing elort wis connedpwithinla self-.contained hoist assembly and in which there isa minimum stress on theyehicle `chassis frame ,throughout fthehoistingstages.V f`

A further object of theginventionis to provide improvementszin devices ofi, the type;V mentioned fin which thehydraulic hoist is connected `-to `the I4; The members havernwifdly yx'fleflilled plate members I BI4 `Weldedthereto; and the brackets I5 are pivotallyconnected to such plates by suitable pivot pins |32. The members It are arranged to rest upon. the upper portions ci -sills Iii Ywhenthe :body `Itis in its -IGWermOSt Position.-

` The body I3 is provided withytransversely exteifrding` bracing membersl whichware welded to the members I4 at spaced intervals therealong. rlransversely extending Y members are alsol welded to the members IGat spacedintervals therealong to brace the same.`

dump bodyand to the .chassis in such ayvay that at all stages ofdumping operation reaction forcesl are present which `reducethe direct forcenofgthe hoist vat the pivot `pointiof thehoist withwthe body, Particularly `at`;the initial stages of `dumping when the `loadforrthe hoist pivot pointiis greatest. i 11u 1 Other objects of :the invention will Vbecome :ap-1` parent from .the following specification,` the `drawings relating thereto hereinafter set forth. kp l In `the drawingsv in `which. like numerals are used to designate like parts yin `the several views throughout: I 1 im. n Figure 1 isa partial Iside elevational View oi fa dump truck, orvlike veholaslwwne in'dotted lines the hydraulicyhoist andlgassociated -niecha-` nismembodying -features-ofgthe present invennon; :12. 1 i n l l zjFig. `2 is a `partial perspective View of a portion of` the `truck` withthe body inta partially' raised position and `*showing thehoistingmecha-` nismforraisingtheloody;.-` f.

. Fig. 3 `is aipantiaLside'view partly insection of` the rear` .portion of, tlietrl,icl andshowing the body raised to substantially its highest posi-` Lion.; and p .y di; i l v 1, Figti` is a .top plan view4 of. the hoist mechanism ofthepresentinvention; l A I, l

,In `the fembodimentof lthev invention shown. in the drawings, a-idurnptrucll-foiimore,or less conventional Aconstruction vis generally indicated .at

and from the claims portedthereon.-^The body I3 has longitudinally extending body memberstlllon the under side of the `floor thereoLeach fof Whichisprovided at its In orderto raiseyand lower the body about the .pivotsV I yIl 2 y anv hydraulic A`hosting device, generally indicated at 2l),` isprovided. Such hoisting Vdevice perse `may comprise standard oriconventional hydrallic cylinder and piston assemblies, andi-n the embodiment shown,-comprising a .cya linder` 2l having .an end cap 2,2 at itsupper `or rearwardly projecting end.` A transversely eX tending member 23 whiehyprojects outwardly' upon the sides of the cylinder 20 is Welded to the lower end thereof and serves to rmount the cylinder V2.1 tothe :member I6 mounted on the chassis II. Stub shafts I9 are fixed `to theends ofthe transverse vmember `23 and are pivotally received lWithin suitable bearings 24 which are fixedtozthe plate memberl Ii for pivotally mounting the cylinder 2I with respect thereto.

cylinder ZIgand hasa piston rod `28 which ex-- tends through the end clap `22. "A suitable packing p element is disposed within the opening through the ca p 22 in surrounding relation to the rod 32,8 inthe usual way. D y

A Ycomfentional gear pump `34 `is mounted through a suitably .mounted plate to the member 23 and may be mounted on eitherside of the cylinder, depending upon' lthe convenient connection for the power take-off. The pump 34"is the conventional constructionand is intended to ibe driven by means of a flexible ushaft which may be suitably connected .to the powertake off box of the vehicle transmission in the usual Way. The

4c .intel the lower emi @time cyiinder 2|, This results in the upward movement :of the piston rod 28g; Whichcauses dumping of .therbody through a connection which will be described y.in detail hereinafter. `lvioyernent lof lthef lever3`8 to the A pistonis reciprocably disposed within the t other side of its neutral position results in reversing the action and causes a lowering of the body.

A leverage mechanism generally indicated at 30, is provided for pivotally connecting the rod 28 to the body. This leverage mechanism rincludes a plurality of linkage members which are so disposed relativeto each other and whichl are so connected `to thechassis frame" and to the body that reaction forces are set up which reduce the compression stresses through the cylinder 2| and piston 23 throughout.l the stages of dumping.

The linkage mechanism 3|] comprises spaced members which are generally triangular in shape. The forward ends of the members 44 nectedtosai'd bod'yJneans pivotally connecting one are pivotally connected to the under sideof ythe body I3 through a pivot rod 4I The ends of suc h pivot rod are mounted within bearing brackets 42 whicharesecuredtothe under side' of the body I3.' The leverage members 44 'are thuspvotally connected to the' body 3A throughlthe pivot 4|. l ..1 The pistonrod 2,8 is pivotally connectedto the membersf44 between the ends thereof byme'ans ofv a pivot shaft 50 whichiis pivotally received through a transverse opening in a mounting member 5| secured to the upper end of the' pis'- ton rod 28 so that the piston rod 28 is pivotally connected to the'members44 intermediate'the ends thereof. f A

The leverage mechanism also includes other linkagemembers 45 which are pivotally connect-v ed to the other ends of the members 44 by means of a pivot shaft 46. The members 45 extend in substantially the same` direction as lthe cylinder 2| andthe rod l2t and the opposite ends ofthe members are pivotally lconnected to the" stub shafts I9. Thus, the distance between the pivots I9` and 4 5 ofthe linkage` rnerribe'rsf45 is fixed throughout `the hoisting stages Afrom the `very beginning to the end thereof.

, During dumping'power is applied to theilower end of cylinder 2| and the cylinder 2| 'and piston rod 28v are in compression. From the very begin-I ning; of hoisting, the rings 45 are in tension; Since there is a commony means, namely, thepivotal shafts |9,'whichconnects the cylinderZI and the links 45 to the chassis, it will 'be appre-Y ciated that there isla reaction force" set up' by the links 45 at 'the pivot pinsf I): Suchreaction force tends to: counterbalance the compression force of the cylinder2I, thereby reducingfthe effective compression forceofsuch cylinder. Since the link 45 is, in effect, of fixed lengthbetween pivots I9 and 46, vsuch reaction force is present throughout the dumping stages and, particularly, at the initial stages when the lifting f orce is greatest.

What is claimed is: u

l; Apparatus for tilting the body` of a dump vehicle comprising, in combination, avehicle chassis, a body pivotally connected to said chassis, a hoist-r ing device havingone end pivotallyconnected to said chasfsi's'and including a reciprocable' element', an elongated leverelement having one end thereof pivotally connected to'said body and pivotally connected to said reciprocal element 'at a fixed position intermediate the ends of said lever ele-l ment, an elongated linkage member having" one end thereof pivotally connected to the other vend of said lever element-at a -fixedposition on said linkage and` lever elements and havingits other end pivotally connected tosaidchassisy forward of the pivotal connection of the linkage member with the lever element, the pivotal connections adjacentthe ends of said linkage member being of a predetermined, xed distance therebetween, said linkage member extending towards said lever element in substantially the same direction as said reciprocable element, and means for reciprocating saidreciprocablegelement to ,tiltgsaidabody with respectftosaid,chassis., f

2. Apparatus for tilting the body of a dump vehicle comprising, in combination, a truck chassis, a body pivotally connected to said chassis, an hydraulicfhoisting device including a cylinder, means pivotally connecting one end o-f said cylinder ft'o. said chassis; a reciprocable element operatively' co'nnfctedwith said cylinder, an elongated lever element'having one end thereof pivotally conendjoffsaid reciprocable element to said lever element at a fixed position intermediate the ends thereof, anelonga'ted linkage .element having one end thereof pivotally connected .to'said chassis through said;rst mainmeans. the otherf end of saidV linkagev element being pivotally connectedto the' other ed of said leverf element at a fixed po# sition on said'linkage and lever elements, the pivotal' connections between the ends ofsaid linkage element being-T of predetermined, fixed distance therebetween,l andmeans forz reciprocatingfsaid reciprocable element totiltzsaiditbody 'with respect to'sad'chassis.-

V.3.-Appa'ratus for? tilting `the vbody of a dump vehicle comprising, in combination, a: lvehicle chassis', a body pivotally connected to said chassis,

anhydraulic hoisting device including a cylinder, a reciprocable power element o-perablyfassociated with said cylinder; an elongated? lever element having. one end 'there/of :pivotallyl connected to said`body,'r'meanspivotally connecting one end of said reciprocable element to said lever element atia;V fixed position intermediate the ends thereof, an elongated; linkage elementk 'having one end thereof pivotally connected to the other endof saidfleverelement at .aix'ed position on said linkageandllever. elements, and common means pivotally connecting 'said cylinder'. and thev other throughout the dumping operation.

4. Apparatus fortilting the' body of a dump vehicle comprising, in combination, a vehicle chassis, a body pivotally'connectedto said chassis, anhydraulic 'hoisting` device including 'a cylinder, f a reciprocable power element oper-ably associated with said cylinder, an elongatedv lever v.element having one end thereof pivotailygconnected' to's'aidbody. means 'pivotally connecting one 'endfof said reciprocable element to saidlever element at `a` fixed position intermediate the ends thereof, an-elo'n 'gated linkage elementhaving one end thereof pivotally connected` vtof'the fother endofVV said lever element at a 'fixedpositionv on ,said linkage and lever elements', and common means pivotally connectingsaid cylinder and f the`other/end Yof said linkage element tofsaid chassis; the lconstruction and arrangement of saidV cylinder, 4'said linkage elementand said common means with respect to each other `beinglsuclr that lupon application of power to saidcylinder,-said'cylinderand reciprocable elementare in compression and said linkage elementi isf in tez'ision' so-that the forces of said cylinder and said linkage element on said common means react against each otherthroughout the dumping of said body.

5. Apparatus for tilting the body of a dump vehicle comprising, in combination,v a vehicle end pivotally connected to said chassis forward of the pivotal connection ofthe linkage member i With the lever element, said elongated linkage h' member being so positioned and connected with the chassis and With the lever element as to be in tension during the hoisting of the body, the

pivotal connections adjacent the ends of said linkage member being` of a predetermined fixed dise tance therebetween, said linkage mernber extending toward said lever element in substantially the same direction as said reciprocable element, and means for reciprocating said reciprocable element to tilt said body with respect to said chassis.

LOUIS S. WOOD. 

